add plugin wolframalpha

plugins/wolframalpha/README.md

@@ -0,0 +1,29 @@
+# WolframAlpha
+
+> A wrapper around Wolfram Alpha. Useful for when you need to answer questions about Math, Science, Technology, Culture, Society and Everyday Life. Input should be a search query. If the result contains an image link, use the markdown syntax to return the image.
+
+## Schema
+[opanapi.json](./opanapi.json)
+
+## Servers
+
+`https://www.wolframalpha.com`
+
+## Operations
+
+1. Calculate
+> `GET` /api/v1/llm-api?input=
+
+## Authentication
+
+type: custom
+location: query
+value: appid=`xxx`
+
+![Authentication](./authentication.png)
+
+## Preview
+
+![Preview](./preview.png)
+
+